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Questions and Problems

Section 5-2

  1. What is a bridge?


  2. Define a segment.


  3. What information is stored in a bridge table?


  4. What is an association on a bridge, and how is it used?


  5. What are excessive amounts of broadcasts on a network called?


  6. Which command is used on a computer to view the contents of the ARP cache?


  7. An empty ARP cache indicates what?


  8. Why do entries into the bridging table have a limited lifetime?


  9. Which of the following are advantages of using a bridge to interconnect LANs?

    1. Works best in low traffic areas
    2. Relatively inexpensive
    3. Can be used to route data traffic
    4. Easy to install
    5. Reduces collision domains

Section 5-3

  1. The network switch operates at which layer of the OSI model?


  2. Another name for a switch is

    1. multiport repeater
    2. multiport bridge
    3. multiport router
    4. multiport hub
  3. How does a switch provide a link with minimal collisions?


  4. The link for a switch connection is isolated from other data traffic except for what type of messages?


  5. Explain what data traffic is sent across a network when a computer pings another computer and a hub is used to interconnect the computers.


  6. Explain what data traffic is seen by computer 3 when computer 1 pings computer 2 in a LAN. A switch is used to interconnect the computers.


  7. Explain the concept of dynamic assignment on a switch.


  8. Define aging time on a switch.


  9. Explain how a switch learns MAC addresses, and where a switch stores the address.


  10. What happens if a MAC address is not stored in CAM on a switch?


  11. Which two modes are used by a switch to forward frames?


  12. Which switch mode offers minimum latency?


  13. What is error threshold, and which mode is it associated with?


  14. Explain the difference in store-and-forward and the cut-through mode on a switch.



  15. How does a layer 3 switch differ from a layer 2 switch?



  16. What is meant by the term wire-speed routing?


Section 5-4

  1. A router uses the network address on a data packet for what purpose?


  2. What is the logical address?


  3. The physical connection where a router connects to the network is called the

    1. router port
    2. network port
    3. network interface
    4. router interface
  4. The connection to the router’s console input is typically which of the following?

    1. RS-232
    2. RJ-45
    3. DB9
    4. RJ-11
  5. AUI stands for

    1. Auxiliary Unit Input
    2. Attachment Unit Interconnect
    3. Auxiliary Unit Interface
    4. Attachment Unit Interface
  6. The AUI port on a router connects to which networking protocol?

    1. 100BASE-T
    2. 10BASE-T
    3. Token Ring
    4. Ethernet

Section 5-5

  1. Define enterprise network.


  2. The router interface most commonly used to interconnect LANs in a campus network is

    1. serial
    2. console port
    3. Ethernet
    4. ATM
  3. Serial interfaces on a router are typically used to

    1. interconnect routers
    2. interconnect hubs
    3. connect to communication carriers
    4. connect to auxiliary ports
  4. The designation E0 indicates

    1. Ethernet port 0
    2. Ethernet input
    3. External port 0
    4. Exit port 0
  5. Routing tables on a router keep track of

    1. port assignments
    2. MAC address assignments
    3. gateway addresses of LANs
    4. routes to use for forwarding data to its destination
  6. The convention used for naming of the serial port 0 on a router is

    1. S0
    2. System 0
    3. Serial interface 0
    4. Serial AUI 0
  7. Define the term gateway.


Section 5-6

  1. What is the purpose of the fast link pulse?


  2. Define full-duplex.


  3. Define half-duplex.


  4. Which of the following is a disadvantage of the auto-negotiation protocol?

    1. Only useful in LANs that have multiple connection capabilities.
    2. A failed negotiation on a functioning link can cause a link failure.
    3. It’s recommended for use in critical network data paths.
    4. It works at 10Mbps.
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